Furnace.



PATENTED JAN. v22, 1907.

J. DOWNING.

FURNAGE.

ABPLIOATION FILED APR.11,1906.

1H: nomas Pzrsns cc., WAL-Hilversu. n, c4

No. 841,947. PATENTED JAN. 22, 1907; Y J. DOWNING.

FURNAGE. APPLICATION FILED APR.11,1906.

2 SHEETS-SHEET 2.

UNITED STATES `PATENT oEEroE.

FURNACE.

Specification of Letters Patent.

Application led April 1l, 1906. Serial No. 311.104.

To all whom, it may concern:

Be it known that I, JAMES DowNING, a citizen of the United States of America, re- Siding at Jeanette, in the county of Westmoreland and State of Pennsylvania, have invented certain new and usefulllmprovements Yin Furnaces, of which the following is a specif fication, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in furnaces; and the invention relates more particularly to the com-4 bustion-chamber or fire-box of a furnace.

The invention has for its primary object to provide a novel form of furnace wherein a draft is created which will tend to carry the heat and products of combustion derived from the combustion-chamber to the forward end of a boiler, thereby insuring the heating of the forward end of the boiler as well as the rear end thereof. To this end I have devised a simple and inexpensive construction for the fire-box of boilers for conveying currents of air to the rear of the firebox, whereby the iirewithin the iire-box will be fed with air and the heat units will lbe conveyed upwardly to the forward end of the boiler, from where they pass rearwardly along the boiler until the rear end of the boiler is reached, at which time Athe products of combustion and heat units are adapted to pass through the liues of the boiler to the exhaust stack or chimney. In this manner I am enabled to heat. the entire lower surface of a boiler, thereby increasing ,the efficiency of the same with a minimum expenditure of fuel.

The detailed construction entering into my improved furnace will be hereinafter more fully described and claimed, and, referring to the drawings accompanying this application, like numerals of reference designate corresponding parts throughout the several views, in which- Figure 1 is a longitudinal sectional view of a furnace constructed in accordance with my invention. Fig. 2 is a front elevation of the same, and Fig. 3 is a cross-sectional view taken on the line 3 8 of Fig. 1.

To put my invention into practice, Iconstruct my improved furnace of two side walls 1 1, a rear wall 2, and a front wall 3, the side walls and rear wall being preferably made of brick, while the front wall is constructed of metal and brick. The upper inner sides of the walls 1 1 support a boiler 4 through the medium of boiler-lugs 5 5 of the usual form.

The boiler 4 is of a conventionalform having iiue's or tubes 6.

My invention resides in providing the walls 1 1 with longitudinally-disposed conduits 7 7 and 8 8, the conduits 7 7 having their outer ends closed by doors 9 9, provided with dampers 1() 10. The conduits 8 8 are simply closed by doors 11 11. The rear ends of the conduits 7 7 terminate upon the rear side of a transverse bridge-wall 12, said wall supporting the boiler 4 intermediate its ends.l The wall 12 is provided with an auxiliary wall 14, which extends upwardly in close proximity to the boiler 4 and, together with the side walls 1 1, supports an arch 15, said arch extending forwardly over the re-box or combustionchamber 16 of the furnace. The walls 12 and 14 form a transverse passage-way 17, and communicating with this passageway are the fines 8 8. The flues 8 8 near their forward ends communicate with the flues 7 7, as at 18. The object of such communication will be presently described. The wall 12 adjacent to the rear ends of the flues 7 7 is provided with ports or openings 19 19, these ports or openings completing communication between the combustion-chamber 16 and the rear side of the wall 12.

The remainder of the furnace-namely, the grate-bars 20, ash-pit 21, iire-boxdoors 22 22, ash-pit doors 23 23, boiler-doors 24 24, and exhaust stack or chimney 25 are similar to theordinary type of furnace. Therefore I deemit unnecessary to further describe the detail construction and arrangement of these parts. f

In Fig. 1 of the drawings I have indicated the course of the products by arrows, and assuming that a fire has been started in the firebox or combustion-chamber 16 the flames are bafiied by the arch 15 and the products of combustion and heat units pass upwardly over the arch 15 to the passage-way 17 and are deflected by the bridge-wall 12 and are carried through the flues 8 8 to the forward end of the furnace and into the iiues 7 7. The air entering the flues 7 7 through the dampers 10 10 of the doors 9 carries the products of combustion rearwardly through the flues 7 7 to the rear side of the wall 12, from Where they pass upwardly into the rear end of the flues 6' boiler to the exhaust stack or chimney 25. It will thus be observed that the passage-way 17 communicates with the ilues 8 8 through openings 26 26, formed at the bottom of the Patented Jan. 22, 1907.

of the boiler 4 and forwardly through the ICO ` walls of the fire-boxer combustion-chamber,

and as these products of combustion are generally ignited the side walls of the ire-boX are greatly heated, thereby facilitating the consumption of fuel within the re-boX or combustion-chamber 16. In providing the ilues 7 7 and 8 8 the products of combustion are carried upon a sinuous route before reaching the exhaust stack or chimney 25, and in this manner a larger number of heat units are derived from the products of combustion than if the products of combustion were permitted to pass directly from the firebox or combustion-chamber to the rear end of the boiler 4.

Vif-hen the iire is first started beneath the boiler, a considerable quantity of gas is generated and before the re has become hot enough to thoroughly ignite and consume all the gas a considerable quantity will escape into the chamber between the wall 2 and the cross-wall 12; but this accumulation of gas will be ignited by the llames escaping through the ports 19 and will thus be consumed and not pass to the boiler or smoke-stack. In a certain sense, therefore, the ports 19 become automatic igniting ports or passa es when under any circumstances combusti le gases escape the flames passing through the flues 7 and 8, as will be obvious.

My invention entirely resides in the flues 7 and 8, walls 12 and 14, and their various openings or passage-ways. Therefore I do not care to coniine myself to the type of furnace in connection with which myimproved construction and arrangement .of flues is used.

Such Schanges as are permissible by the appended claims may be resorted to without departing from the spirit and scope of the invention.

What I claim, and desire to secure by Letters Patent, is-

1. In a furnace, the combination with a boiler, of side walls supporting said boiler, a transverse wall arranged between said side walls and engaging said boiler, said transverse wall having a transverse passageway formed therein, each side wall having two longitudinally disposed conduits formed therein, said conduits communicating at their forward ends, one of said conduits terminating in said passage-way, while the other of said conduits terminates upon the rear yside of said transverse wall, said wall having ports formed therein each communicating with one of the passages in each side wall, substantially as described.

2. In afurnace, the combination with a boiler, of side walls supporting said boiler, a transverse wall arranged between said side walls, and supporting an arch, said transverse wall having a passage-way formed therein, said side walls having conduits formed therein, one of said conduits terminating in said passage-way, and another of said conduits extending through and terminating at the rear side of said transverse Wall and communicating with the space at the rear of said transverse wall.

In testimony whereof I afliX my signature in the presence of two witnesses.

JAMES DOVNING.

Witnesses:

SAMUEL M. CORD, Jos. P. HOOK. 

